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WASSCE
The work function of a metal is 2.56 × 10-19J. Calculate the frequency of a photon whose energy is required to eject from the metal an electron with a kinetic energy of 3.0eV.
[1eV = 1.6 x 10-19J; h = 6.6 x 10-34Js]
[1eV = 1.6 x 10-19J; h = 6.6 x 10-34Js]
A.
5.56 x 1019Hz
B.
1.66 x 1019Hz
C.
1.12 x 1015Hz
D.
8.42 x 1014Hz
Answer: C
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